Muscles of the Arm

Question 1

Is ulna or radius more medial?

Answer 1

Ulna

Question 2

Movements of the forearm at the elbow

Answer 2

Extension

Flexion

Question 3

Movements of the forearm between radius and ulna

Answer 3

Pronation

Supination

Question 4

Which spinal nerves form the brachial plexus?

Answer 4

C5, 6, 7, 8 and T1

Question 5

5 terminal nerves

Answer 5

Musculocutaneous
Median
Radial
Ulnar
Axillary

Question 6

Which 3 terminal nerves form the M?

Answer 6

Muculocutanous
Median
Ulnar

Question 7

Which 2 terminal nerves branch from the posterior cord?

Answer 7

Axillary

Radial

Question 8

Which 2 terminal nerves have branches from all 5 spinal nerves?

Answer 8

Median and Radial

Question 9

Pectoralis major functions

Answer 9

Flexion
Extension
Adduction
Medial rotation
of the ARM

Question 10

Pectoralis minor function

Answer 10

Protracts and depresses scapula

Question 11

Biceps brachii (attachments, functions)

Answer 11

Long head attaches glenoid fossa and radius
Short head attaches coracoid process and radius
Flexes arm
Flexes and supinates forearm

Question 12

Coracobrachialis function

Answer 12

Flexes arm

Crosses shoulder joint

Question 13

Brachialis function

Answer 13

Flexes forearm

Crosses elbow joint and attaches to ulna

Question 14

Which terminal nerve innervates the muscles in the anterior compartment of the arm?

Answer 14

Musculocutaneous nerve

Question 15

Triceps brachii (attachments, functions)

Answer 15

Long head attaches glenoid fossa and ulna
Medial (deep) and lateral head attach humeral shaft and ulna (do not cross the shoulder joint)
All 3 heads extend forearm
Long head extends arm

Question 16

What terminal nerve innervates the triceps?

Answer 16

Radial nerve

Question 17

Blood supply of the upper limb

Answer 17

Subclavian artery -passes first rib-> axillary artery –> brachial artery –> radial and ulnar artery

Question 18

3 cords of the brachial plexus

Answer 18

Lateral
Medial
Posterior
Refers to relative position to axillary artery

Question 19

Hitting what nerve is the “hitting one’s funny bone” feeling?

Answer 19

Ulnar nerve

As it crosses the elbow posteriorly

Question 20

What spinal nerves contribute to
1. Lateral
2. Medial
3. Posterior 
cords?

Answer 20

1. C5, C6, C7
2. C8 and T1
3. C5 to T1

Question 21

What spinal nerves contribute to:

1. Axillary nerve
2. Musculocutaneous nerve
3. Median nerve
4. Radial nerve
5. Ulnar nerve

Answer 21

1. C5, C6
2. C5, C6, C7
3. C5-T1
4. C5-T1
5. [C7], C8, T1

Question 22

Which muscle is pierced by the musculocutaneous nerve as it enters the arm?

Answer 22

Coracobrachialis

Question 23

Where does the ulnar nerve cross the elbow?

Answer 23

Posterior surface

In a groove on the medial epicondyle of the humerus

Question 24

Axillary nerve supplies… (2)

Answer 24

Teres minor

Deltoid

Question 25

3 heads of the triceps brachii

Answer 25

Long head
Medial (deep) head
Lateral head